Add loops.InfiniteLoop

Author: devlights

examples/basic/loops/examples.go

@@ -18,4 +18,5 @@ func (r *register) Regist(m mapping.ExampleMapping) {
 	m["loops_channel_loop"] = ChannelLoop
 	m["loops_map_loop"] = MapLoop
 	m["loops_range_loop"] = RangeLoop
+	m["loops_infinite_loop"] = InfiniteLoop
 }

examples/basic/loops/infinite_loop.go

@@ -0,0 +1,33 @@
+package loops
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// InfiniteLoop は、無限ループのサンプルです.
+func InfiniteLoop() error {
+	var (
+		mainCtx, mainCxl = context.WithCancel(context.Background())
+		procCtx, procCxl = context.WithTimeout(mainCtx, 3*time.Second)
+	)
+
+	defer mainCxl()
+	defer procCxl()
+
+	// Go では 無限ループ は以下のように for {} とだけ書く
+LOOP:
+	for {
+		select {
+		case <-time.After(200 * time.Millisecond):
+			fmt.Print(".")
+		case <-procCtx.Done():
+			break LOOP
+		}
+	}
+
+	fmt.Println("")
+
+	return nil
+}